Variable "v" is connected to M2tklib. M2tklib will ALWAYS display the value of v. At any time you may assign a value to "v" and after the next call to the "draw" procedure it will display the current content of "v"Controll flow would be:1. Jump from top menu to sub dialog (e.g. time change menu)2. During jump: Assign current sensor value (in your case RTC value) to "v" (prepare_user_input)3. Let the use change "v" though m2tklib4. If user pressed cancel, go back to main menu without any further action5. If user presse ok, store value of "v" to the external device (e.g. RTC), jump back to main menu (apply_user_input).

I thinks that soon i will be able to the test my menu with display and button ... you was telling me that the button will active when "low",correct ? is necessary a resistor ? if you can provide to me a little schema will be great :-) ... so my understanding is this ...

correct ? just the idea what means active low could i test with serial menu ?

1) Ok buttonAlmost correct, except that you need to use the correct function prototype (see element reference for M2_BUTTON on the wiki page) and probably you want to refer to a submenu. That means, that m2.setRoot() is missing

4) Adding a display.Please follow this tutorial: http://code.google.com/p/m2tklib/wiki/t02lcNote: The correct name for the graphics handler is "m2_gh_lc"!Also take care to use m2_SetLiquidCrystal() as shown in the tutorial!

Not sure if i got your question right, but it is like this:Usually you willattach 2 or more hardware buttons and a physical LCDWith the serial monitor option you can do:attach 2 or more hardware buttons and simulate the LCD via the serial monitororsimulate 2 ore more buttons via serial monitor and attach a physical LCDorsimulate 2 ore more buttons via serial monitor and simulate the LCD via the serial monitor

Good Morning Oliver,I've did some test with LCD ... now I would ask to you if is possible change LCD pin ?

because inside my sketch I'm using "Virtual Wire Library" where as default use a

PIN 11 for rx and PIN 12 for tx and PIN 10 for push to talk ... well I've tried to specify other pint to use with the function but the display still to work not properly ... If i comment the part related to Virtual Wire everything is working well ...